Grok 4.20 vs Grok 4.3
Side-by-side comparison of API pricing, specs, benchmarks, and capabilities
| Specification |
by xAI
|
by xAI
|
|---|---|---|
| Overview | ||
| Status | Current mid tier | Current flagship |
| Released | Oct 1, 2025 | Apr 30, 2026 |
| Pricing per million tokens | ||
| Input | $1.25/Mtok | $1.25/Mtok |
| Output | $2.50/Mtok | $2.50/Mtok |
| Blended avg | $1.88/Mtok | $1.88/Mtok |
| Cached input | $0.200/Mtok | — |
| Specifications | ||
| Context window | 256K tokens | 1M tokens |
| Parameters | Proprietary | Proprietary |
| Speed (TPS) | — | — |
| Modalities | ||
| Input |
textimage
|
textimage
|
| Benchmarks sources: xAI model card / xAI model card, Artificial Analysis | ||
| GPQA Diamond | 78 vendor | 80 |
| SWE-Bench Verified | 58 vendor | 65 |
| Humanity's Last Exam | 32 vendor | 38 |
| ARC-AGI 2 | 38 vendor | 42 |
| AIME 2025 | 80 vendor | 85 |
| MMMLU | 84 vendor | 86 |
| BFCL | 75 vendor | 78 |
| HumanEval | 88 vendor | 90 |
| MATH 500 | 85 vendor | 88 |
| Avg benchmark score | — | 72.4 |
| Perf / dollar | — | 38.6 |
| Independent composite scores each on its own scale — not part of the average above | ||
| LMSYS Chatbot Arena | 1474.4 ELO | 1442.4 ELO |
| AA Intelligence Index | — | 37.6 |
| AA Agentic Index | — | 24.1 |
| AA-Omniscience Index (−100–100) | — | 18.3 |
| Providers | ||
| Available from |
xAI — $1.25/$2.50/Mtok
|
xAI — $1.25/$2.50/Mtok
|
Cost at scale
1M tokens · 50/50 input/output| Volume | Grok 4.20 | Grok 4.3 | Savings |
|---|---|---|---|
| 1M tokens | $1.88 | $1.88 | $0 (0%) |
| 10M tokens | $18.75 | $18.75 | $0 (0%) |
| 100M tokens | $187.5 | $187.5 | $0 (0%) |
| 1000M tokens | $1875 | $1875 | $0 (0%) |
When to pick which
distilled from the pricing and spec data above- your workload re-reads context (agents, RAG, long chats): cached input costs $0.200/Mtok — 84% off its list input price, a discount Grok 4.3 doesn't offer
- you need the longer context: 1M tokens vs 256K (3.9×)
The cheaper option here — Grok 4.20 costs $1.88/Mtok blended on xAI.
Summary
Grok 4.20 by xAI costs $1.25/Mtok input and $2.50/Mtok output, with a 256K-token context window. It supports text, image input.
Grok 4.3 by xAI costs $1.25/Mtok input and $2.50/Mtok output, with a 1M-token context window. It supports text, image input.
The two aren't directly comparable on average benchmark score: Grok 4.3 has published per-benchmark results, while Grok 4.20 does not yet — it is measured today on independent composites (see the table above).
Note: Pricing is per million tokens. Actual costs vary with usage patterns, prompt caching, and batch discounts. Always verify against official provider pricing pages.